WO2007129927A1 - Procédé de transformation ininterrompue de matériaux contenant des oxydes de fer et installation pour sa mise en oeuvre - Google Patents

Procédé de transformation ininterrompue de matériaux contenant des oxydes de fer et installation pour sa mise en oeuvre Download PDF

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Publication number
WO2007129927A1
WO2007129927A1 PCT/RU2006/000230 RU2006000230W WO2007129927A1 WO 2007129927 A1 WO2007129927 A1 WO 2007129927A1 RU 2006000230 W RU2006000230 W RU 2006000230W WO 2007129927 A1 WO2007129927 A1 WO 2007129927A1
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WO
WIPO (PCT)
Prior art keywords
slag
metal
melt
iron
carbon
Prior art date
Application number
PCT/RU2006/000230
Other languages
English (en)
Russian (ru)
Inventor
Anatolij Anatoljevich Golubev
Jurij Alexandrovich Gudim
Original Assignee
Obchestvo S Ogranichennoi Otvetstvennostju Promishlennaja Kompanija 'tekhnologija Metallov'
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Obchestvo S Ogranichennoi Otvetstvennostju Promishlennaja Kompanija 'tekhnologija Metallov' filed Critical Obchestvo S Ogranichennoi Otvetstvennostju Promishlennaja Kompanija 'tekhnologija Metallov'
Priority to PCT/RU2006/000230 priority Critical patent/WO2007129927A1/fr
Publication of WO2007129927A1 publication Critical patent/WO2007129927A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/004—Making spongy iron or liquid steel, by direct processes in a continuous way by reduction from ores
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B11/00—Making pig-iron other than in blast furnaces
    • C21B11/08—Making pig-iron other than in blast furnaces in hearth-type furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
    • C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/006—Starting from ores containing non ferrous metallic oxides
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
    • C21B13/029—Introducing coolant gas in the shaft furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/56—Manufacture of steel by other methods
    • C21C5/567—Manufacture of steel by other methods operating in a continuous way
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B5/00—General methods of reducing to metals
    • C22B5/02—Dry methods smelting of sulfides or formation of mattes
    • C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing agents
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/04—Working-up slag
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the invention relates to metallurgy and can be used for the processing of iron ores, including titanomagnetite, waste slag, dust, sludge from metallurgical production and other materials containing iron oxides.
  • blast furnaces There are various methods of processing materials containing iron oxides: smelting cast iron in blast furnaces, direct reduction of iron by solid-phase and liquid-phase reduction methods.
  • Blast furnaces widely used in ferrous metallurgy, have the highest thermal efficiency, but require significant costs for the preparation of iron ore materials, coke production and high capital costs for creating a production cycle.
  • blast furnaces are not suitable for processing most of the waste slag from metallurgical production, the reserves of which are huge in our country and abroad.
  • Blast furnaces cannot economically process poor iron ores, as well as iron ores with refractory waste rock. Installations of solid-phase direct reduction of iron also require significant costs for the enrichment and preparation of iron ore raw materials and cannot economically process poor iron ores and waste slag from the metallurgical industry.
  • Such raw materials can be processed by plants (aggregates) operating on the principle of direct liquid-phase reduction of iron.
  • the bubbling layer saturated with a carbon reducing agent to a volume content of carbon of 5-50% in it, which is retained during melting in those the same limits.
  • bubbling of the slag layer is carried out by products formed by burning natural gas and / or liquid carbon, an inert gas or a gas with an oxygen content of less than 35%.
  • the proposed method for the continuous processing of materials containing iron oxides solves the problem of improving the technical and economic indicators of the process of liquid-phase reduction of iron from materials containing iron oxides.
  • the technical result of the proposed method for the continuous processing of materials containing iron oxides is to eliminate the disadvantages of the closest analogue, namely:
  • SUBSTITUTE SHEET (RULE 26) refractory bricks.
  • the upper part of the walls and the vault of the melting chamber are water-cooled.
  • the release of metal and slag is carried out continuously from the respective settling tanks located on opposite sides of the melting chamber, through openings located at different levels, equipped with gutters.
  • Reduction of iron occurs in a liquid slag bath obtained from iron oxide-containing charge materials and fluxes.
  • the heat source and the reducing agent of iron is steam coal, which is loaded into the slag melt together with the charge materials.
  • lances are installed in the walls of the melting chamber, blowing oxygen directly into the slag melt.
  • an additional row of tuyeres is installed above the slag melt, which supply oxygen to the free space of the chamber.
  • the proposed unit for the continuous processing of materials containing iron oxides solves the problem of improving the design of the device for the continuous melting of charge materials and liquid-phase reduction of iron, increasing its productivity and improving the technical and economic indicators of the method of continuous processing of materials containing iron oxides.
  • the technical result of the proposed unit for the continuous processing of materials containing iron oxides is to eliminate the disadvantages of the closest analogue, namely:
  • the volume of the reduction zone in the slag melt is increased to 70- 80% of the volume of the melt and delimit it with the oxidation zone, for this, the melting of the charge materials is carried out in a melting chamber with a cooled liquid metal heat the carrier with a casing of heat installed 0.3-0.8 m above the maximum level of the slag melt of fuel-oxygen burners with torches immersed in the melt; iron is reduced by carbon-containing materials injected into the stream of heated nitrogen by injectors located 0.10-0.40 m above the maximum level reduced metal, mixing the slag and metal melts is carried out heated in the heat exchangers of the cooling circuit, the heat of the cooled liquid metal coolant to 150-250 0 C nitrogen, vd washed through porous plugs in the
  • the dust trapped in the system for capturing and treating gases leaving the unit is blown with a special injector into the slag melt located in the melting chamber, using nitrogen heated to 150-250 0 C as the carrier gas.
  • the slags obtained after processing materials containing iron oxides are granulated and used in cement production.
  • the main steelmaking converter slag is used as the charge material, and the resulting final slag after granulation is used as a Portland cement clinker.
  • the mixture is heated before being loaded into the melting chamber and the iron is partially reduced in it on the conveyor passing through the hermetic casing by the process gases leaving the melting chamber.
  • the melting chamber is equipped with fuel-oxygen burners installed 0.3-0.8 m higher than the maximum level of the slag melt; for the injection of carbon-containing materials and dust trapped in the gas purification into the slag melt, the chamber is located 0.10-0.40 m higher the maximum level of the recovered metal by injectors, for the conveyor loading of charge materials and the selection of process gases, the chamber has a common hole located above the level of the slag melt in the side forming a casing, nitrogen is used in the heat exchangers of the cooling circuit to cool the metal coolant, which is then used to inject carbon-containing materials and dust into the slag melt, and porous plugs are blown into the melt through the hearth lining installed in the lining, and the slag and metal chutes are displaced relative to each other friend, providing the possibility of simultaneous discharge into one bucket of metal and unreduced slag.
  • the longitudinal axis of the troughs for the release of metal and slag are shifted in the horizontal plane by an angle of 5 - 25 degrees.
  • SUBSTITUTE SHEET (RULE 26) Heating the unit with fuel-oxygen (gas-oxygen or mazuto-oxygen) burners with torches immersed in the melt provides a significantly lower amount of unburned monoxide during the process, which reduces the overall fuel consumption, increases thermal efficiency and increases the productivity of the melting unit, due to better heat transfer conditions and, accordingly, less heat loss with flue gases.
  • fuel-oxygen gas-oxygen or mazuto-oxygen
  • the simultaneous discharge of metal and unreduced slag with an iron oxide content of 5-15% into one ladle from the melting chamber allows to increase the productivity of the melting unit by reducing the slag melt residence time in it, to quickly restore slag due to a significant increase in the slag-metal contact surface in the ladle to an iron oxide content of 2-6% and refine the resulting iron-containing metal from undesirable impurities: carbon, silicon, phosphorus.
  • Granulation of the final slags obtained in the aggregate allows their use as useful additives in the production of cement.
  • the final slag of the process in chemical and mineralogical composition corresponds to Portland cement clinker and can be used as such in the production of Portland cement.
  • SUBSTITUTE SHEET (RULE 26) Heating the charge before loading it into the melting chamber and partially recovering the charge iron on the conveyor passing through the sealed casing by the process gases leaving the melting chamber reduces the fuel and oxygen consumption for heating the chamber, accelerates the processes of charge melting and iron reduction and increases the unit's productivity.
  • the use in the unit of continuous processing containing iron oxides for its heating (melting the charge and compensating for the cost of heat for endothermic iron reduction reactions) located 0.3-0.8 m above the melt of fuel-oxygen burners with torches immersed in the melt can dramatically reduce the amount of oxidation zone in the melt and, accordingly, increase the productivity of the unit, as well as increase the degree of extraction of iron from charge materials.
  • SUBSTITUTE SHEET (RULE 26) the ability to reduce capital costs and fuel consumption in the production process.
  • cooling circuit in heat exchangers for cooling liquid metal coolant nitrogen allows the use of nitrogen heated to 150 - 25O 0 C for injection of materials into the melt and melt mixing (feeding through porous plugs in the lining of the unit bottom), which makes it possible to improve the course of charge melting and reduction iron, increase productivity, reduce heat loss of the unit and reduce fuel consumption.
  • FIG. 1 shows a general view of an apparatus for the continuous processing of materials containing iron oxides.
  • the method of continuous processing containing iron oxides of materials is as follows.
  • the charge materials are loaded into the melting chamber, melted, iron is reduced with carbon, and the resulting metal and slag are released.
  • the volume of the reduction zone in the slag melt is increased to 70-80% of the volume of the melt and delimits it with the oxidation zone.
  • the melting of charge materials is carried out in a melting chamber with a cooled liquid metal coolant casing heat installed
  • SUBSTITUTE SHEET (RULE 26) 5 to 8m 0,3-0 above the maximum level of molten slag-fuel burners with torches immersed in the melt.
  • the reduction of iron is carried out with carbon-containing materials, injected in a stream of heated nitrogen by injectors located 0.10-0.40 m above the maximum level of the reduced metal.
  • Mixing the slag and metal melts is carried out with the heat of the cooled liquid metal coolant heated in heat exchangers of the cooling liquid metal to 150-250 0 C with nitrogen, injected through porous plugs in the refractory lining of the bottom of the melting chamber, and with carbon monoxide bubbles CO released from the slag melt during iron reduction.
  • the slag melt in the melting chamber is not restored, the slag containing 5-15% of iron oxides is poured from the melting chamber simultaneously with the obtained iron-carbon alloy into one ladle, while the slag is reduced, and the iron-carbon alloy is refined from undesirable impurities: carbon, silicon, phosphorus, etc. .d.
  • the dust trapped in the system for capturing and treating gases leaving the unit is blown with a special injector into the slag melt located in the melting chamber, using nitrogen heated to 150-250 0 C as the carrier gas.
  • the slags obtained after processing materials containing iron oxides are granulated and used in cement production.
  • the main steelmaking converter slag is used as the charge material, and the resulting final slag after granulation is used as a Portland cement clinker.
  • the mixture is heated before being loaded into the melting chamber and partially restored in it
  • the unit for continuous processing of materials containing iron oxides contains a melting chamber 1 with a casing 2 cooled by a liquid metal coolant, in the working space of which there is a restored slag melt 4, limited by walls with a skull 6, and metal 9 in a lined bath 8, 12.
  • the melting chamber 1 is equipped with fuel and oxygen burners 3 installed at 0.3 - 0.8 m above the maximum level of the slag melt 4
  • injectors 5 and 17 located at 0, 10 - 0.40 m above the maximum reduced metal level 9.
  • the chamber 1 has a common opening 21 located above the level of the slag melt 4 in the side generatrix of the casing 2, connected to a sealed casing 19 containing the conveyor 18.
  • heat exchangers 16 of the cooling circuit 14 - 15 use nitrogen to cool the metal coolant (not shown), which is then used to inject 4 carbon-containing materials and dust into the slag melt and blow porous plugs 13 into the melt 4 through the hearth lining 12 installed in the lining
  • the longitudinal axis of the groove 7 for draining the slag and the longitudinal axis of the groove 10 for draining the metal into the bucket 11 are displaced in a horizontal plane relative to each other by
  • SUBSTITUTE SHEET (RULE 26) an angle of 5 - 25 degrees, providing the possibility of simultaneous discharge into one ladle of metal and unreduced slag.
  • Injectors 17 inject heated nitrogen into the slag melt 4 in a stream of carbon-containing materials with a slight excess against the calculated one at a height of 0.10-0.40 m above the maximum level of the reduced metal 9, which creates good conditions for the reduction of iron from iron oxides of slag without unnecessary carbonization of the metal melt.
  • the volume of the reduction zone is increased to 70-80% of the volume of melt 4, more clearly delineating (separating) the oxidation and reduction zones of the slag melt and reducing the amount of dust released from the unit with process gases.
  • SUBSTITUTE SHEET (RULE 26) baths combinations of the effects of carbon monoxide bubbles emitted during iron reduction, and the deposition of metal kings, recovery processes proceed rather quickly.
  • the bath is slightly cooled, and the total thermal efficiency of the unit increases.
  • metal 9 and unreduced slag 4 with an iron oxide content of 5-15% in one ladle 11 are drained from the melting chamber 1, reducing the residence time of the slag melt 4 in it, and quickly reducing the slag due to a significant increase in the slag-metal contact surface in the ladle 11 to a content of iron oxides of 2-6% and refining of the obtained iron-containing metal from undesirable impurities: carbon, silicon, phosphorus.
  • the dust captured in the gas capture and purification system 20 of the unit is blown into the slag melt 4 by a special injector 17 in a stream of heated nitrogen, which allows to reduce environmental pollution and increase the degree of extraction of iron from charge materials.
  • Purging the slag-metal melt with inert gas through porous plugs in the bottom lining is used to mix the melt and steel in arc furnaces [6] and to mix the metal and slag in steel casting ladles during out-of-furnace steel refining [1].
  • the composition of the slag after its partial recovery is close to the composition of Portland cement clinker.
  • SUBSTITUTE SHEET (RULE 26) indicates the possibility of obtaining Portland cement clinker when implementing the proposed method for the continuous processing of materials containing iron oxides. Literature.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
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  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

L'invention concerne la métallurgie et peut être utilisée pour la transformation de minerais, y compris les minerais de titane et de magnétite et d'autres matériaux contenant des oxydes de fer. Le procédé consiste à provoquer la fusion des matières de charge dans une chambre de fusion (1) chauffée au moyen de brûleurs à combustible et oxygène (3) montés à 0,3 - 0,8 m au-dessus du niveau maximal des matières de laitier en fusion (4), les torches étant immergées dans les matières en fusion. La réduction du fer est effectuée avec des matériaux contenant du carbone injectés dans un flux d'azote préchauffé, au moyen d'injecteurs (5, 17), qui sont disposés à un niveau supérieur de 0,10 - 0,40 m au niveau du métal réduit (9). Pendant ce processus, le volume de la zone de réduction dans des matières de laitier en fusion est porté à 70 - 80% du volume des matières en fusion et est délimité avec la zone d'oxydation. Le mélangeage des matières de laitier en fusion et des matières de métal en fusion s'effectue avec de l'azote chauffé à 250°C injecté à travers des bouchons poreux (13) dans le revêtement réfractaire de la sole (12) de la chambre de fusion ainsi que par les bulles de CO qui s'élèvent. Le métal et le laitier insuffisamment réduit sont regroupés dans une même poche (11) au moyen de goulottes d'évacuation de métal et de laitier, décalé l'une par rapport à l'autre. L'invention permet d'augmenter la productivité du processus et le degré d'extraction de fer ainsi que d'améliorer les paramètres technico-économiques du processus.
PCT/RU2006/000230 2006-05-05 2006-05-05 Procédé de transformation ininterrompue de matériaux contenant des oxydes de fer et installation pour sa mise en oeuvre WO2007129927A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/RU2006/000230 WO2007129927A1 (fr) 2006-05-05 2006-05-05 Procédé de transformation ininterrompue de matériaux contenant des oxydes de fer et installation pour sa mise en oeuvre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/RU2006/000230 WO2007129927A1 (fr) 2006-05-05 2006-05-05 Procédé de transformation ininterrompue de matériaux contenant des oxydes de fer et installation pour sa mise en oeuvre

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WO2007129927A1 true WO2007129927A1 (fr) 2007-11-15

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB923233A (en) * 1958-06-07 1963-04-10 Roman Rummel A process and apparatus for smelting metal oxide-containing dusts or ores in finely divided or particulate form
SU1593236A1 (ru) * 1982-12-17 1996-04-10 Московский институт стали и сплавов Устройство для непрерывной плавки железорудного сырья в жидкой шлаковой ванне
RU2139938C1 (ru) * 1998-07-16 1999-10-20 ООО "Корпорация СиВ" Способ переработки железомарганцевого сырья

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB923233A (en) * 1958-06-07 1963-04-10 Roman Rummel A process and apparatus for smelting metal oxide-containing dusts or ores in finely divided or particulate form
SU1593236A1 (ru) * 1982-12-17 1996-04-10 Московский институт стали и сплавов Устройство для непрерывной плавки железорудного сырья в жидкой шлаковой ванне
RU2139938C1 (ru) * 1998-07-16 1999-10-20 ООО "Корпорация СиВ" Способ переработки железомарганцевого сырья

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
KURUNOV I.F.: "Sostoyanie i perspectivy bezdomennoi metallurgii zheleza", M.: CHERMETINFORMATSIYA, 2002, pages 129 - 134 *

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